Marcel Reutegger created OAK-306:
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Summary: Limit session refresh on namespace registry use
Key: OAK-306
URL: https://issues.apache.org/jira/browse/OAK-306
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core, jcr
Reporter: Marcel Reutegger
Priority: Minor
Currently the session associated with a NamespaceRegistryImpl refreshes
itself via the NamespaceRegistryImpl.refresh() callback whenever a namespace
(prefix or URI) is looked up or modified. See OAK-149. This contradicts with
one of the goal we have in Oak to provide a stable snapshot view of the
repository and only move to the the most recent revision when explicitly
requested via Session.refresh(boolean).
Jukka and I had a discussion about this today and we'd like to change the
current behaviour the following way:
- The NamespaceRegistryImpl should read at the same revision as the
associated JCR Session. This may somewhat violate the spec, because then
the NamespaceRegistry does not immediately see new namespaces added by
another client, but we don't give that guarantee anyway when it comes
to reading the latest root. With an explicit Session.refresh(), an attempt
can be made by the client to make new namespaces visible created by other
sessions.
- The NamespaceRegistryImpl only calls refresh() when it modifies namespaces
to make sure the associated session sees them in the in-content representation.
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